factory lsd or nothing

[Larry" <rocco16v@netzero.com (Larry)]

Jason-
  I like the way you think. :)

Larry   sandiego16V

So...yeah, the factory unit isn't worth
> > > much. :)
> > > Neal
> >
> >Yes, but it is better than nothing (from experience).
>
> Really?
>
> Assume for a second that I am at full throttle in 2nd gear at 3000rpm.  My
> left wheel hits unobtanium, which has a ZERO coefficient of friction --
> i.e. black ice from hell.  My right wheel is on dry pavement.
>
> At 3000rpm, a 1.8 puts somewhere around 98 lb-ft of torque to the output
of
> the tranny.  Of course, this is multiplied by gearing.  2nd gear on a 16V
> is 2.12:1, the final drive is 3.67... so the overall ratio is
> 7.78:1.  Therefore, the torque acting on the wheels is 762lb-ft.
>
> With a 2% limited slip, the torque acting on the wheel on dry pavement is
> 2% of 762 lb-ft, which is 15 lb-ft.  On a 185/60-14 tire, which has a
> radius of 0.67 feet, the thrust is only 10 lb... and this is at full
throttle!
>
> 10lb of thrust is basically negligible, so it's really not better than
> nothing; it really *is* nothing. :)
>
> If the Scirocco had a 30% limited slip, that value would jump from 15lb-ft
> to 190.5 lb-ft. or 127lb of thrust.
>
> On a 5% grade, the Scirocco would be pushing downhill with (2350lb * 5%) =
> 117lb of thrust.  So basically, if you were trying to climb a 5% grade
with
> a 30% limited slip and one wheel getting 0 traction, at best you would
just
> about stand still and not roll backwards down the hill, as you would have
a
> net thrust of (127-117)= 10lb of thrust pushing you up the hill.  That
> ain't much.
>
> However, you're better off than with no limited slip, where the car would
> roll down with 117lb of thrust.  The 2% limited slip would drop that down
> to 107lb.. but when you hit the guard-rail at the bottom, you'd probably
> say that the 2% LSD did just about nothing.
>
> Physics lesson over -- and hey Meze -- no comments about how you don't
have
> snow or ice where you live.  The way you drive, you need all the fucking
> help you can get. :)
>
> Jason


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